[Beowulf] RRDtools graphs of temp from IPMI

Gerry Creager gerry.creager at tamu.edu
Sat Nov 8 21:14:10 PST 2008

To Bernard, Chris and Joe, especially,


Now, for the flame-bait.  Bernard suggests cacti and/or ganglia to 
handle this.  Our group have heard some mutterings that ganglia is a 
"chatty" applicaiton and could cause some potential hits on or 1 Gbe 
interconnect fabric.

A little background on our current implementation:  126 dual-quad core 
Xeon Dell 1950's interconnected with gigabit ethernet.  No, it's not the 
world's best MPI machine, but it should... and does... perform admirably 
for throughput applications where most jobs can be run on a node (or 
two) but which don't use MPI as much as, e.g., OpenMP, or in some cases, 
even run on a single core but use all the RAM.

So, we're worried a bit about having everything talk on the same gigabit 
backplane, hence, so far, no ganglia.

What are the issues I might want to worry about in this regard, 
especially as we expand this cluster to more nodes (potentially going to 
2k cores, or, essentially doubling?

Thanks, gerry

Joe Landman wrote:
> Gerry Creager wrote:
>> We're collecting a CSV dataset of node temps from IPMI for our Dell 
>> 1950s.  Now we're trying to plot this in RRDtools.  Anyone got a good 
>> script already cast to do this or do we need to start reinventing the 
>> annular transportation device?
>> Thanks, gerry
> probably a little cut and paste from here ... 
> http://search.cpan.org/~mschilli/RRDTool-OO-0.22/lib/RRDTool/OO.pm
> You can also parse the CSV here, so it should be fairly simple to create 
> what you need.  You can see code which generates RRDgraphs from here 
> http://mailgraph.schweikert.ch/pub/mailgraph-1.14.tar.gz .

Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University
Cell: 979.229.5301 Office: 979.862.3982 FAX: 979.862.3983
Office: 1700 Research Parkway Ste 160, TAMU, College Station, TX 77843

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